Door threshold



FIG. 1 is a perspective view of a door threshold showing our new design, the door threshold is broken in the center to show indeterminate length;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereto, the broken lines showing the lower portion of a door is for illustrative purposes only and form no part of the claimed design;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design of a door threshold, as shown and described. 